Yes very interesting numbers, but what about ratios over time.
As written earlier the number of posts does not say anything about the quality of the posts. Not attacking you, nor other members, just stating this.
And even though you, the group that left, certainly contributed, the ones staying have done so too and will keep on doing it. I know, I'm not a long time member but have given several things to the community already, just check my signature.
Many others also share their knowledge and time here, and new members will hopefully do that too.